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Parametric or Nonparametric?

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A diner has been surveying their customers for the past couple of years about their dining experience in the restaurant. The survey uses a scale of one to five, five being the best to indicate the customer's satisfaction. The diner's customer satisfaction averaged 2.5 last year, but this year it is 2.9. Is this difference statistically significant?

How do I determine if this is parametric or nonparametric?

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The expert examines parametric or non-parametric tests.

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You use parametric test on data if they are interval or ratio data and if you make assumptions about the ...

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